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\begin{document}

\title{Extreme drought alters the vertical distribution but not the total
amount of grassland root biomass}



\author[1]{Yunlong Zhang}%
\author[2]{Chong  Xu}%
\author[2]{Jie  Wang}%
\author[2]{Tian  Yang}%
\author[3]{Yuguang  Ke}%
\author[2]{Honghui  Wu}%
\author[4]{Xiaoan Zuo}%
\author[2]{Wentao  Luo}%
\author[5]{Melinda Smith}%
\author[6]{Elizabeth Borer}%
\author[7]{Iain Hartley}%
\author[2]{Ingrid J.  Slette}%
\author[2]{Wenping Yuan}%
\author[2]{Minggang  Xu}%
\author[8]{Xing-Guo Han}%
\author[9]{Guirui Yu}%
\author[3]{Qiang Yu}%
\affil[1]{CAAS}%
\affil[2]{Affiliation not available}%
\affil[3]{Chinese Academy of Agricultural Sciences Institute of Agricultural Resources and Regional Planning}%
\affil[4]{Agriculture and ecology research department, Cold and Arid Regions of Environmental and Engineering Research Institute, Chinese Academy of Sciences}%
\affil[5]{Colorado State University}%
\affil[6]{University of Minnesota}%
\affil[7]{Exeter}%
\affil[8]{State Key Laboratory of Vegetation and Environmental Change}%
\affil[9]{Information Management Group for the Synthesis Center of Chinese Ecosystem Research Network (CERN)}%


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  \date{May 17, 2024}


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\begin{abstract}
Extreme drought impacts ecosystem function and processes dramatically.
However, a comprehensive understanding of how extreme drought affects
root biomass at regional scales remains elusive. Here, we investigated
the effects across six grasslands with extreme drought treatment
replicated across a precipitation gradient in Inner Mongolia, China. We
found the root biomass and belowground net primary productivity (BNPP)
were significantly positively correlated with precipitation at the
reginal scale. Extreme drought decreased the slope of this correlation
in 0-10 cm and increased in 10-20 cm. Root biomass and BNPP increased by
extreme drought in the four relatively arid sites and decreased in the
two relatively mesic sites in 0-10 cm, and the reverse pattern showed in
10-20 cm. These shifts were driven by the response of soil moisture. Our
findings suggest that including vertical responses of belowground
primary productivity to extreme drought should improve models
predictions of plant roots to future climate change.%
\end{abstract}%



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